6mm is a great scale for those games that you always wanted to play but never had the space but works just as well at minor fracas sized games. To my mind the advantages far outweigh the disadvantages so most of my chaps are now of the tiny scale. I say go for it, you don't really need that much to start with and you might amaze yourself.

Apart from my own blog, have a look at this chaps 6mm stuff, they are lovely and a great advert for the size. (Actually, being H&R they are technically 5mm but it's close enough.)

It's really the case that that I've just no room- or time- for more scales. Apart from the little men and their little models, I'd need to produce/buy a whole new terrain system.

There are two big advantages over larger scales from what I can see- more troops and 'to scale' battles. Even in 15mm, which is as low as I go, the terrain is always going to be out of 'sync' with the figures- unless you go skirmish.